26 AET, 7. T. TJIMA : HEXACTINELLIDA, IV. 



the parataiigentials bore — one a single and the other three — 

 prickles, suggestive of the same occuring in Rossella antarc- 

 tiea. 



The dermalia (PI. II., fig. 2) are stauractins, nearly flat or 

 perceptibly concave on the inner side. The microtubercles, which 

 beset the rays all over, are distinctly developed. The rays slightly 

 taper outwards, to end in a rounded manner. Axial length, 250- 

 360 // (300 /'• on an average) ; breadth of ray near the center, 

 7-12 // (10 !>■ on an average). In forming the quadrate-meshed 

 latticework, two rays of the directly adjoining dermalia run, 

 as usual, alongside of each other for the greater part of 

 their length. The meshes generally measure 140-180 // in length 

 of sides. — Exceptionally and quite rarely the dermalia are met 

 with in the straight diactinic form. Of more frequent occurrence 

 here and there are oxystauractinic forms with smooth and un- 

 usually thin rays. They are evidently dermalia that have not yet 

 attained full development. 



The dermalia of the second specimen from Inside Okinose 

 require special mention in that pentactinic forms were not seldom 

 found amongst them. 



The gastralia (PI. II., fig. 4) are hexactins much larger 

 than the dermalia, but with similarly characterized rays. Axial 

 length, generally 0.55-1.00 mm. (0.75 on an average) ; breadth 

 of ray close to base, 15-22 n. The free proximal ray shows no 

 point of special differentiation from the rest. Though the 

 spicules are present in tolerable abundance, the paratangentials 

 form but rarely meshes of approximately quadrate shape. The 

 layer lies closely upon parenchymalia, of which none can however 



